Physical and Chemical changes M

Which of the following is a physical change?

• burning paper
• shredding paper
• having a precipitate form
• making a new substance

Which of the following is a sign that a chemical reaction has occurred?

• changing in shape
• melting
• formation of a gas
• dissolving

Is hammering wood together a physical or chemical change

• chemical
• physical

Which of the following is NOT an example of a physical change

• souring of milk
• breaking a pencil
• coloring a picture
• freezing water

Adding baking soda to vinegar together and it fizzes and produces carbon dioxide is an example of what change

• physical
• chemical

what is the definition of physical change?

• any change that results in the formation of new chemical substances
• rusting
• changes affecting the form of a chemical substance, but not its chemical composition
• any property that is measurable, whose value describes a state of a physical system

One cup of water is left outside for two days when it was checked there was only half a cup left. What happened?

• evaporation; chemical change
• condensation; physical change
• evaporation; physical change
• condensation; chemical change

Which process is an example of a purely physical change?

• A peanut butter sandwich is eaten and broken down by enzymes in the stomach
• Carrots are cut into small pieces and mixed into a salad.
• Sodium metal and chlorine gas are combined to form sodium chloride, or table salt.
• Sodium metal and water are combined to form a basic compound and a flammable gas.

What is freezing?

• an increase in size
• change in state where a liquid changes to a gas
• a change in state where a liquid changes to a solid
• a change in state where a solid changes into a liquid

What is sublimation?

• where a gas turns into a liquid
• where a gas turns into a solid
• where a solid turns into a liquid
• where a solid turns into a gas